Aqueous electrophoretic deposition of YSZ electrolyte layers for solid oxide fuel cells

Abstract

A 6-μm-thick, dense, and uniform yttria-stabilized zirconia (YSZ) thin-film electrolyte for solid oxide fuel cell was able to be formed, via aqueous electrophoretic deposition, onto a porous Ni-YSZ cermet anode, which was made via attrition mill, pressure casting, and pressureless sintering. Nonconductive yet suitably porous substrates could be used for electrophoretic deposition, with the help of an auxiliary electrode. Ni/YSZ cermet presintered at 1,200°C and reduced at 700°C, on the other hand, behaved like a metal electrode and required no more the use of such an auxiliary electrode. It was also found that the deposition rate increased with increasing current density and with decreasing NH 4 -polyacrylate concentration.

Colloidal processing and sintering of porous percolative Ni-YSZ layers

“…Processing of metallic powders in a liquid media allows the application of a wide number of shaping techniques, already developed for ceramic suspensions, to fabricate complex shaped samples, or to design complex microstructures like dispersion of second phases or fabrication of multilayers and coatings by tape casting, electrophoretic deposition or dip coating [26][27][28]. These special microstructures are useful for electrochemical applications where an intimate metal-ceramic joining is required as well as phase distributions which enable the electrical and ionic conductivity.…”

La1-xSrxCo1-yFeyO3-d (LSCF) Composite as Durable Cathode Materials for Intermediate-Low Temperature Solid Oxide Fuel Cell: Research Review

“…Walau bagaimanapun, masih terlalu sedikit hasil kajian yang dilaporkan mengenai penggunaan kaedah EPD bagi penghasilan elektrod. Berdasarkan kepada kajian kepustakaan yang telah dibuat, Santillán et al (2009) merupakan penyelidik awal yang melaporkan penghasilan fiem nipis berliang bagi katod LSCF ke atas substrat GDC pada voltan kenaan 20 V. Filem katod lantanum strontium ferit (LSF) pula telah berjaya dihasilkan oleh Asamoto et al (2009) Yaseen et al (2007) dengan penggunaan pelarut akueus telah menghasilkan filem BaTiO 3 setebal 1 µm pada tempoh pengendapan 2 minit dengan voltan kenaan 3 V. Penggunaan larutan akueus bagi proses EPD memerlukan agen penyerakan partikel dan bahan tambah untuk memastikan pengendapan filem katod yang baik diperolehi (Cherng et al 2008;Santillán et al 2009;Zhao et al 2006).…”

Aqueous Tape Casting Using Organic Binder: A Case Study with YSZ

“…It possesses high ionic conductivity due to oxygen ion vacancies created by the dopant yttrium. It is chemically, thermally, and structurally stable across a wide temperature range . The most important criterion which the YSZ film must satisfy to qualify as an electrolyte in the above applications is that it should be of high density, closest as far as possible to its theoretical density and devoid of any porosity.…”

“…It is chemically, thermally, and structurally stable across a wide temperature range. [13][14][15][16] The most important criterion which the YSZ film must satisfy to qualify as an electrolyte in the above applications is that it should be of high density, closest as far as possible to its theoretical density and devoid of any porosity. The pre-requisite for fabrication of a dense, defect-free tape is to establish homogeneous and stable slurry with uniform packing of the particles.…”